finish phase 3: type-only codemod and zero non-bridge @atproto/api imports

Task 8: codemod repointed 150 namespace-type files to #/lexicons
(AppBskyFeedDefs.PostView -> app.bsky.feed.defs.PostView, .Record -> .Main)
plus ~105 hand-fixed consumers (composer/video state, DebugMod, Profile,
onboarding, dialogs). DM_SERVICE_HEADERS deleted; last chat call sites on
the chat client. RichText.tsx flipped to SDK-only. Remaining @atproto/api
importers: the three session bridge files, the deliberate dual-world
matcher in lib/xrpc-error.ts, and test fixtures. toLex boundary casts are
TODO(phase4)-tagged for bridge removal.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/screens/Messages/components/RequestButtons.tsx

@@ -1,5 +1,4 @@
 import {useCallback} from 'react'
-import {type ChatBskyActorDefs, type ChatBskyConvoDefs} from '@atproto/api'
 import {Trans, useLingui} from '@lingui/react/macro'
 import {StackActions, useNavigation} from '@react-navigation/native'
 import {useQueryClient} from '@tanstack/react-query'
@@ -58,7 +57,7 @@ export function RejectMenu({
   label?: string
   icon?: boolean
   convo: ConvoWithDetails
-  profile: ChatBskyActorDefs.ProfileViewBasic
+  profile: chat.bsky.actor.defs.ProfileViewBasic
   showDeleteConvo?: boolean
   currentScreen: 'list' | 'conversation'
 }) {
@@ -216,7 +215,7 @@ export function AcceptChatButton({
 }: Omit<ButtonProps, 'onPress' | 'children' | 'label'> & {
   label?: string
   icon?: boolean
-  convo: ChatBskyConvoDefs.ConvoView
+  convo: chat.bsky.convo.defs.ConvoView
   onAcceptConvo?: () => void
   currentScreen: 'list' | 'conversation'
 }) {
@@ -314,7 +313,7 @@ export function DeleteChatButton({
 }: Omit<ButtonProps, 'children' | 'label'> & {
   label?: string
   icon?: boolean
-  convo: ChatBskyConvoDefs.ConvoView
+  convo: chat.bsky.convo.defs.ConvoView
   currentScreen: 'list' | 'conversation'
 }) {
   const {t: l} = useLingui()